The world's most powerful AI hacker.
Tenzai's agents discover, chain, and exploit the vulnerabilities scanners miss — across every application you ship, continuously. Real attack techniques. Reproducible exploits. The craft of an elite human, at the scale only AI can deliver.
AI changed the attackers. Defense has to change too.
For thirty years, the best testers in the world have been a small group of skilled humans. They still are.
But the surface they're asked to cover has changed — more apps, more releases, more environments — and the attackers they face now have AI.
AI changed both sides of the equation.
Engineering ships more code, faster, with AI assistance — a meaningful share reaching production with weaker review.
Frontier models can now reason about code, chain weaknesses, and produce working exploits. Capabilities that required elite human hackers are now widely available.
More of your apps are exposed to more attackers.
AI hackers will be testing your applications. The only question is whose side they're on.
Meet Tenzai.
An AI hacker on your side.
Tenzai runs full pentests end-to-end. It reasons about your application the way an expert human would — discovering attack surface, chaining weaknesses, and producing reproducible exploits with the evidence to fix them.
It's transparent and guidable. Your team can scope it, direct it, narrow it, and review its reasoning at every step.
It scales to every application you ship. Continuously. Without scheduling a red team engagement.
Find all exploitable risk
An agentic harness that’s purpose-built for elite hacking in complex, enterprise environments
- Deep, exhaustive testing across the entire attack surface
- Discover complex business logic and chained vulnerabilities
- High accuracy, reducing false positives
- Continuous agent learning with every run
Most teams find something worth fixing in the first four hours.
What changed for them.
"120× faster. Compliance work that took quarters now takes days."
“Tenzai has been a complete game changer for our PT team … letting us do more in one week than we used to in five. We’re regularly uncovering critical and high-severity issues, many granting admin-level access.”
"From 4% coverage of our critical apps to 100%. Without growing the team."
Built by human hackers.
Founded in 2025 by cybersecurity veterans Pavel Gurvich, Ariel Zeitlin, Ofri Ziv, Itamar Tal, and Aner Mazur. Backed by world-class investors — $75 million in record seed funding.
From the lab.
Ranking against 125,000 human hackers across six global CTF platforms
How Tenzai placed in the top 1% on websec.fr, hack.arrrg.de, websec.co.il, Lakera Gandalf, pwnable.tw, and dreamhack.io — and what the ranking actually proves about offensive AI.
Post-Mythos: what every CISO should do next
Anthropic's Claude Mythos found 2,000+ zero-days in seven weeks. A prioritized action list for security leaders working in a post-Mythos environment.
Chaining business-logic flaws: an autonomous case study
A walkthrough of a real Tenzai engagement — five low-severity findings composed into a single high-impact exploit path the customer's team had missed.